Influence of Regio-Configuration on the Phase Diagrams of Double Chain Giant Surfactants

doi:10.1021/acs.macromol.7b02383

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	Influence of Regio-Configuration on the Phase Diagrams of Double Chain Giant Surfactants
	Ni, PH; Hu W(胡渭); Zhang,; He, JL; Li, WH; Yang, SG; Hu, W; Jiang, WB; Jin, PF; Shao, Y
刊名	MACROMOLECULES
	2018
卷号	51 期号:3 页码:1110-1119
ISSN号	0024-9297
DOI	10.1021/acs.macromol.7b02383
文献子类	Article
英文摘要	It has been established that a minute difference of the primary chemical and topological structures influences the self-assembly behaviors of giant surfactants; however, the regio-configuration effect has been rarely reported. Herein, we report a systematic study on the self-assembly behaviors of a series of double-chain giant surfactant regio-isomers, which consist of a hydrophilic polyhedral oligomeric silsesquioxane (POSS) head and two identical hydrophobic polystyrene (PS) tails with various molecular weights tethered in para-, meta-, and ortho-configurations, respectively. Small-angle X-ray scattering and transmission electron microscopy characterizations have been combined to investigate the phase behaviors of each sample and construct the phase diagrams for the three isomers with respect to the molecular weights of PS tails. It is observed that the regio-configuration significantly impacts the self-assembly behaviors of the giant surfactant isomers, including order-to-disorder (ODT) and order-to-order (OOT) transitions. In each isomer system, the order-to-disorder transition temperature (T-ODT) changes nonmonotonically with the length of PS tails, which is generally similar to the variation of T-ODT for block copolymers but also exhibits some peculiar features associated with the rigid conformation of headgroup. With equal length of PS tails, T-ODT of the three isomers is in the descending order of ortho > meta > para. There is a pronounced and systematic phase boundary shift to lower volume fraction of PS (f(PS)) and to lower temperatures from para to meta to ortho. This is closely related to the compounds regio-configuration and rigid 3D conformation of the headgroup and may be understood through the lower effective f(PS) as two tails get further apart. These findings elucidate the sophisticated effect of the regio-configuration on self-assembly behaviors. It suggests regio-configuration as an additional factor in tuning the self-assembly of giant surfactants at sub-10 nm or even sub-5 nm length scales, which is of significant technical importance.
电子版国际标准刊号	1520-5835
WOS关键词	ORDER-DISORDER TRANSITION ; BLOCK-COPOLYMER ; SHAPE AMPHIPHILES ; THIN-FILMS ; INTERACTION PARAMETER ; THERMAL-PROPERTIES ; LITHOGRAPHY ; METHACRYLATE) ; NANOSTRUCTURES ; NANOPARTICLES
WOS研究方向	Polymer Science
语种	英语
WOS记录号	WOS:000425473600048
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/285671]
专题	高能物理研究所_核技术应用研究中心高能物理研究所_粒子天体物理中心
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Ni, PH,Hu W,Zhang,,et al. Influence of Regio-Configuration on the Phase Diagrams of Double Chain Giant Surfactants[J]. MACROMOLECULES,2018,51(3):1110-1119.
APA	Ni, PH.,胡渭.,Zhang,.,He, JL.,Li, WH.,...&Wang, XM.(2018).Influence of Regio-Configuration on the Phase Diagrams of Double Chain Giant Surfactants.MACROMOLECULES,51(3),1110-1119.
MLA	Ni, PH,et al."Influence of Regio-Configuration on the Phase Diagrams of Double Chain Giant Surfactants".MACROMOLECULES 51.3(2018):1110-1119.